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Alert Notice 401: Monitoring of EX Hya and DQ Her

August 13, 2009

Kunegunda Belle, Don Hoard and Steve Howell are observing two cataclysmic variables with Spitzer during the next couple of weeks. They request ground-based light curves spanning the observation intervals so that they can identify the state each variable is in during the Spitzer visits.

DQ Her normally sits at V=14.5, but remember that this is a deeply eclipsing system (280 minute period) and during eclipse it will dip below V=18.

The researchers request that you obtain a time series light curve, preferably in V-band, starting at least one day prior to and continuing one day after the Spitzer visit to the appropriate field. Expose long enough to get signal/noise = 30 in each individual frame.